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<!-- DFIN ActiveDisclosure(SM) XBRL Schema Document - http://www.dfinsolutions.com/ -->
<!-- Creation Date      : 2020-10-29T18:21:46.2236858+00:00 -->
<!-- Version            : 5.0.1.513 -->
<!-- Package ID         : a4da189df73348b6a46358a60dcbee68 -->
<!-- Copyright (c) 2020 Donnelley Financial Solutions, Inc. All Rights Reserved. -->
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  <xsd:element id="lxu_LiabilityReserve" name="LiabilityReserve" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="lxu_ClaimAmountNotApprovedForPayment" name="ClaimAmountNotApprovedForPayment" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="lxu_PrejudgmentInterest" name="PrejudgmentInterest" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="lxu_PercentageOfAccruePostJudgementInterest" name="PercentageOfAccruePostJudgementInterest" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="lxu_AccruedPreJudgmentAndPostJudgmentInterest" name="AccruedPreJudgmentAndPostJudgmentInterest" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="lxu_NonOperatingOtherIncomeNetMember" name="NonOperatingOtherIncomeNetMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="lxu_GainLossOnSaleNaturalGasForwardContracts" name="GainLossOnSaleNaturalGasForwardContracts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="lxu_UnrealizedGainLossOnNaturalGasForwardContractsHeld" name="UnrealizedGainLossOnNaturalGasForwardContractsHeld" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="lxu_PreferredParticipationRightsInDividendsAndLiquidationCommonStockShareEquivalent" name="PreferredParticipationRightsInDividendsAndLiquidationCommonStockShareEquivalent" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="lxu_FairValueOfNaturalGasContracts" name="FairValueOfNaturalGasContracts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="lxu_SeniorSecuredNotesMember" name="SeniorSecuredNotesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="lxu_StateDeferredTaxAssetNotAbleToUtilize" name="StateDeferredTaxAssetNotAbleToUtilize" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="lxu_PreferredStockIncreasedDividendRatePercentage" name="PreferredStockIncreasedDividendRatePercentage" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="lxu_AprilTwoThousandTwentyOneMember" name="AprilTwoThousandTwentyOneMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="lxu_AprilTwoThousandTwentyTwoMember" name="AprilTwoThousandTwentyTwoMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="lxu_AprilTwoThousandTwentyThreeMember" name="AprilTwoThousandTwentyThreeMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="lxu_SeriesFRedeemablePreferredStocksMember" name="SeriesFRedeemablePreferredStocksMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="lxu_CommonStockVotingRightsShares" name="CommonStockVotingRightsShares" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="lxu_TemporaryEquityAccretionLiquidationPreference" name="TemporaryEquityAccretionLiquidationPreference" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="lxu_TemporaryEquityAccretionDiscountAndStockIssuanceCosts" name="TemporaryEquityAccretionDiscountAndStockIssuanceCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="lxu_StockholdersEquityLineItems" name="StockholdersEquityLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="lxu_StockholdersEquityTable" name="StockholdersEquityTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="lxu_ChemicalMember" name="ChemicalMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="lxu_AgriculturalProductsMember" name="AgriculturalProductsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="lxu_IndustrialAcidsAndOtherChemicalProductsMember" name="IndustrialAcidsAndOtherChemicalProductsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="lxu_MiningProductsMember" name="MiningProductsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="lxu_WeightedAverageRevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod" name="WeightedAverageRevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="lxu_AffiliateOfLSBFundingMember" name="AffiliateOfLSBFundingMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="lxu_CapitalExpendituresIncurredButNotYetPaidAndRecievables" name="CapitalExpendituresIncurredButNotYetPaidAndRecievables" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="lxu_AccretionOfRedeemablePreferredStock" name="AccretionOfRedeemablePreferredStock" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="lxu_CashPaymentsForAbstract" name="CashPaymentsForAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="lxu_SupplementalCashFlowInformationLineItems" name="SupplementalCashFlowInformationLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="lxu_SupplementalCashFlowInformationTable" name="SupplementalCashFlowInformationTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="lxu_OwnershipChangeDescription" name="OwnershipChangeDescription" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
</xsd:schema>
